package com.heima.admin.gateway.filter;


import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Objects;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否是登录接口，是的话直接放行
        if (request.getURI().getPath().contains("login")) {
            return chain.filter(exchange);
        }
        //若不是登录接口，需要获取token
        String token = request.getHeaders().getFirst("token");
        //判断token是否存在，不存在直接返回401（无权限访问）
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();//返回结束
        }
        //解析token，判断是否有效
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        if (Objects.isNull(claimsBody)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        } else {
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 0) {
                //无效token
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            } else {

            }
        }
        //说明token有效，进行解析
        Object id = claimsBody.get("id");
        ServerHttpRequest serverHttpRequest = request.mutate().header("userId", "" + id).build();
        //重置header
        exchange.mutate().request(serverHttpRequest).build();
        //放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
